Doug,
Thanks for the info. Can you tell us about any possible improvements in file quality? Will the credo have the pixel binning and ISO 1600 - forget what it's called in the IQ series?
And people that never shot the Hy6/AFi may not understand the big deal made about the rotating sensor and articulating screen. The ergonomics of the Hy6/AFi body are different from lots of cameras but once you get it, you don't want anything else. It's fantastic and I think the best I ever used. All adjustments fall at your finger tips and you never need to change your position or take your hand from the grip to do anything or take your eye away from the finder. Even rotating the sensor from landscape to portrait can be done this way. Since you don't have to turn your camera body and arms and head like you do on the DF body for example the shooting is very fluid. This also allows for some great finders 45, lupe, and WLF that you couldn't use well on the DF. The rotating sensor on the AFi-ii backs was a brilliant design by Leaf.
With a Credo you would remove the back, rotate it, and put it back on. This is not as suave as an internally rotating sensor, but for many it will be a minor annoyance rather than a serious deficiency.
The other not-intuitive thing is that the viewing angle of the Credo screen is MUCH better than the AFI screen. So while it cannot tilt (which is handy, especially at more extreme angles) it does not need to be directly tilted directly at the photographer to get a good view. This does not fully offset the desire for an articulating screen, but it should take a lot of the sting off.
Pixel binning in the IQ series is called Sensor+. It is not available on the Credo.
The base ISO of the Credo 80mp is ISO35, and has a maximum long exposure of 120 seconds. The base ISO of the Aptus-II 12 is 50 and the maximum long exposure is 32 seconds. So for those shooting over 15-20 seconds improvements can be expected in both noise, tonal smoothness, and color.
Some minor improvements to color and noise due to the difference in auxiliary processing components can be expected. However, in practical testing we've found those to be pretty minor. Frankly the image quality from the AFI/Aptus-II 12 is hard to improve on.
The major difference, and it really is major if you've not personally used a Credo, is the speed with which the user interface lets you hone in on the ideal image. The ability to zoom to 100% and scroll around the image with nearly instant rendering, instead of the considerable lag of the AFI/Aptus-II is a major improvement to practical workflow.